Martingale Dog Collar Size: The collar comes in three sizes. The width of the small-code collar is, and the adjustable range of the length is; The width of the medium collar is, and the adjustable range of the length is; The width of the large-size collar is, and the adjustable range of the length is; Collar material: martingale dog collars are made of heavy duty nylon webbing and soft padded, strong, comfortable and breathable. The metal accessories D-ring, it's easy for hanging tags and leash. Dog Collars Color: The color of the dog collars; Pink, orange, black, blue, red, gray. Safety Reflective Puppy Collars: Nylon webbing with reflective strip, making the collar more beautiful at the same time, can be safer at night walking. Adjustable collar: By adjusting the buckle, The length of the collar can be adjusted, you can adjust the collar according to the size of your dog's neck, so that it is more comfortable and free to wear.